MCM Electronics

RDL Audio Controlled Relay By Radio Design Labs (ST-ACR2) MCM Part #555-ST-ACR2

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Audio Controlled Relay

The ST-ACR2 is an Audio Controlled Relay in the STICK-ON® series. These products are designed for quick, convenient installation, and reliable operation in a variety of control applications. The ST-ACR2 is designed to switch on line level sources.Two multiturn trimmers are provided. The SENS potentiometer adjusts the audio input sensitivity. A threshold LED facilitates accurate adjustment.

Specifications Top

The module can be set to trigger on signals between -30 dBu and 0 dBu. The DELAY control sets the time required for the relay to release when the audio drops below the threshold.The delay adjustment range for the ST-ACR2 is from 5 seconds to 50 seconds.

  • Switching Controlled by Audio Signal
  • Sensing of Line-Level Signal
  • Silence Sensing
  • DPDT Switching Contacts
  • Open-Collector SLAVE Output

Input Connections: May be connected balanced or unbalanced
Control Output: Open-collector @ 25 mA suitable to drive indicators or slave LCR relay
Indicators: Audio threshold LED (for setting sensitivity)
Retrigger Delay: 250 ms
Contacts: Double-pole-double-throw
Max. Switching Power: 60 W, 125 VA
Max. Switching Voltage: 220 VDC, 250 VAC
Max. Switching Current: 2 A
Activation Response Time: 25 ms
Input Sensitivity: -30 dBu to 0 dBu (adjustable)
Relay Release Delay: 5 sec. to 50 sec. nominal (adjustable)
Ambient Operating Environment: 0° C to 55° C
Power Requirement GROUND-REFERENCED, 24 VDC @ 50 mA*
* Assumes 20 mA max load at SLAVE output
Dimensions: Height: 0.7" (1.7 cm), Width: 3" (7.6 cm), Depth: 1.6" (3.9 cm)
Package Dimensions: 2" x 2" x 4"
Shipping Weight: 0.2 lbs.

Part Numbers
MCM Part #:555-ST-ACR2
Radio Design Labs Part #:ST-ACR2
Package Specifications & Dimensions
Weight:0.23 lbs.
Warranty:1095 days
Need to Return?
Length:4.25 in.
Width:2.25 in.
Height:2 in.
Shipping Information
Extra Shipping Charge:No
Drop Ship:No
Catalog Pages
MCM Cat 57, Page 149
MCM Cat 56, Page 164
View in Catalog

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